Blower



Feb. 6, 1934. v B, M HESS 1,946,162

BLOWER Filed June 6, 1932 5 Sheets-Sheet l 'd I l 29 4** d, i Q W W 14 ,ZZ ff/ v ZZ 9 ,FWZ 50 x u j, l l l i J5 /v lll "l 5v' 52 Z6 50 l #'27 2Q f 14 j@ JM MAMIUWI ZZ J5 u| ZZ I fpm v "L -QZ?'ZWe/UU?,

@QM WW B. M. HESS Feb. 6, l1934.

BLOWER Filed June G, 1932 5 Sheets-Sheet 2 wi M l lll.

6, 1934. B, M, H555 I 1,946,162

BLOWER 3 Sheets-Sheet 3 I Filed June e, 19:52

Patented Feb. 6, 1934 Nrre srss 6 Claims.

My invention relates, more particularly, to blowers of the type comprising a blade-equipped rotor mounted in a casing comprising a scrollportion constituting the side wall thereof and in which the rotor is eccentrically disposed, to present a passage for the fluid operated on by the blades, of progressively increasing cross-sectional area toward the discharge of the blower.

My objects are to provide a novel, simple, and relatively inexpensive construction of blower of the type above referred to; to provide a novel arrangement for ensuring an air-tight joint between the edges of the scroll and the end plates of the blower-casing; to pro-vide a blower casing of such construction that the parts thereof may be quickly and easily assembled; and other objects as will be manifest from the following description.

Referring to the accompanying drawings:

Figure l is a view in side elevation of a blower constructed in accordance with my invention, the blower being viewed at the line 1 on Fig. 3 and in the direction of the arrow.

Figure 2 is a view in sectional elevation of the blower.

Figure 3 is a plan section taken at the line 3 on Fig. 1 and viewed in the direction of the arrow.

Figure 4 is an enlarged broken fragmentary sectional view taken at the line 4 on Fig. 1 and Viewed in the direction of the arrow.

Figure 5 is an enlarged sectional view of the portion of the blower lying within the encircling dotted line on Fig. 2.

Figure 6 is an inner face view of one of the end plates of the blower showing it of a forma- "j tion suitable when these plates are to be made of pressed metal.

Figure 7 is a plan sectional view of the end plate of Fig. 6, the section being taken at the line 7 on Fig. 6 and viewed in the direction of the arrow.

Figure 3 is an enlarged fragmentary sectional view through the end plate of Fig. 6, the section being taken at the line 8 on Fig. 6 and viewed in the direction of the arrow; and

Figure 9, an enlarged fragmentary sectional view of the plate of Fig. 6 assembled with the scroll portion of the blower, the section being taken at the line 9 on Fig, 6 and viewed in the direction of the arrow.

Referring to the construction shown in Figs. 1-5, inclusive, the blower comprises a casing 10 formed of end-members 11 of cast metal and similar in construction, except that they are provided as rights and lefts, and each apertured as represented at 12 to form inlets for the fluid to be operated on by the blower. The casing also comprises a scroll-member 13 formed, as for example of sheet metal, which is interposed between the end members 11 and forms the side wall of the casing, the ends of the scroll member 13 terminating adjacent the discharge outlet 14 of the casing and forming with the end-members l1, the Walls of the discharge outlet le.

The blower also comprises an air-forcing element shown as in the form of a blade-equipped rotor 15 located in the casing and journaled at the shaft 16 thereof in bearings 17 mounted on cross-members 18 on the end-walls 11 at the openings 12, the shaft 16 being shown as provided with a pulley 19 by which to drive it.

The rotor 15 in accordance with common practice is so positioned that it extends substantially concentric with the openings 12, and the scrollmember 13 is so disposed that at one end portion thereof it extends close to the outer edges of the blades of the rotor 15 as shown in Fig. 2, and from this point progressively recedes from the blades substantially to the discharge outlet 14, thereby forming a passage for the fluid operated on by the rotor 15 which progressively increases in cross section toward the discharge outlet 14.

In accordance with the particular construction shown, each end-member 11 is formed on its inner face with a flange 20 which is of a shape corresponding with the shape it is desired the scroll member 13 assume when the parts of the casing are assembled. The flanges 20 extend from the lower edges of the end-members 11 at the discharge outlet 1e rearwardly and partially around the rotor 15 as shown, terminating at points substantially coincident with that portion of the scroll-member 13 which extends closest to the blades of the rotor, the outer faces of these flanges inclining toward the interior of the casing as represented at 21, and being engaged by the side edges 22 of the scroll-member 13.

rIhe scroll-member 13 adjacent the upper terminal ends of the anges 20 and represented at 23 is forwardly curved as represented at 24 at the side-edge of which portion it extends around arcuate flanges 2.5 on the end-walls 11 and lin engagement with inclined faces 26 thereof. Beyond the flanges the scroll-member 13 is substantially fiat as represented at 13a and overlies flanges 27 on the inner faces of the end-walls 11 and engages at its side-edges with the upper surfaces of the anges 27 which are downwardly and inwardly inclined as represented at 28.

rThe parts of the casing are secured together at intervals by tie-rods 29 which extend from one wall 11 to the other thereof through holes in bossequipped portions 3G thereof as shown.

' The ends of the scroll-member 13 are secured in place by screws 31 passing freely through the lower forward edge of the scroll-member and screwing into the lower forward edges of the flanges 20 above them, and by screws 32 which pass freely through the upper forward edge of the scroll-member and screw into the flanges 27 beneath them.

In assembling the parts of the blower-casing the scroll member 13 is secured at its edge to the anges 2e and 27 by the screws as stated and the tie rods 29 then applied to position and tightened. In the tightening of the tie rods 29 the inclined surfaces 2l, 26 and 28 of the flanges 20, 25 and 27, respectively, move inwardly in engagement with the side edges of the scroll member 13 thereby exerting an action on the member 13 tending to expand it which is resisted by the connection of the scroll-member at the screws 31 and 32, with the result that the flanges wedge tightly against the side surfaces of the scroll-member causing the scroll-member and flanges to be connected together substantially fluid-tight joints.

If desired the end walls of the blower-casing may be made of pressed sheet metal. In Figs. 6, 7, 8 and 9 one of the end-walls for the blower' formed of such material is represented, it being understood that the other end wall thereof would be the same as that shown except reversed, viz., these walls would be provided as rights and lefts.

In this construction the end-walls would be provided on their inner faces with flanges represented at 33, 34 and 35 and corresponding with the flanges 20, 25 and 27, respectively, of the preceding gures, these flanges having inclining surfaces 36, 37 and 38, respectively, as explained and shown of the flanges 20, 25 and 27, the flanges 33, 3e and 35 being formed by bending the metal forming these end-walls, and the inclined surfaces referred to being provided by obliquely positioning these flanges relative to the face of the end-walls as shown.

The scroll-member 13 as in the case of the construction of the preceding figures would be secured at its ends to the forward lower ends of the flanges 36 at the screw holes 39 and to the flanges 35 at the screw holes 40 and the end walls and scroll-member secured tightly together as in the case of the construction of Figs. 1-5 by tie rods one of which is shown at el and which would extend through holes 42 in ears 43 projecting outwardly from the marginal edges of the end-walls.

The desired flat base for the blower is shown as formed of angle members le secured, as by screws 45 and the lower tie-rods 42, flatwise against the outer faces of the end-walls of the casing.

While I'have illustrated and described certain particular constructions embodying my invention, I do not wish to be understood as intending to limit it thereto as the same may be variously modified and altered and the invention embodied in other forms of structure without departing from the spirit thereof.

What I claim as new and desire to secure by Letters Patent, is:

l. A blower-casing comprising end-walls, a scroll member therebetween, means restraining the ends of said scroll member, means carrie-d by the end walls presenting inclined surfaces to contact the edges of said member operating in the assembling of said walls and member to force said er said last-nailed means into tightjointforming condition, means holding walls and member in assembled condition.

2. A blower-casing comprising end-walls, a scroll member therebetween, means restraining the ends of said scroll member, means at which the joint between said end walls and the edges of said member is produced presenting inclined surfaces to contact the edges of said member operating in the assembling of said walls and member to exert force ainst said member tending to expand it and thereby produce a tight llt between walls and member, and means for holding said walls and member in assembled condition.

3. A blower-casing comprising end-walls, a scroll member' therebetween, means restraining the ends of said scroll member, on said end walls having inclined surfaces engaged by the edges of said member in the assembling of said walls and member and operating to force said member and walls into tight-joint forming condition and means for holding walls and member assembled condition.

e. A blower-casing comprising end-walls, a scroll member therebetween, means restraining the ends of said scroll member, anges on said end walls having inclined surfaces engaged by the edges of said member in the assembling of said walls and member and operating to exert force against said member tending to expand it and thereby produce a tight nt between said walls and member, and means for holding said walls and member in assembled condition.

5. A blower-casing comprising end-walls, a scroll member therebetween, means restraining the ends of said scroll member, means carried by the end walls presenting inclined surfaces to contact the edges of said member operating in the assembling of said walls and member to force said member and said last-named means into tight-joint-forrning condition, and means connecting walls and operative to draw the latter into tight-joint-forming position relative to said member.

6. A blower casing comprising, in combination: end walls slitted at their edges to define spaced ears each projecting in the plane of its wall; the margins of the end walls between said ears turned to an acute angle with the plane of said walls; a scroll member the side margins thereof in contact with the outer surfaces of each of said turned margins; means adjacent the ends of said scroll to restrain the same against relative movement between said ends and the walls longitudinally of the member; tension rods connecting pairs of corresponding ears; and means to tension said rods to wedge said turned margins against the margins of said member.

BRYCE M. HESS.

Civ.

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